<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <img src="" alt="">
    <button>点击</button>
</body>
</html>
<script>
    const img = document.querySelector("img");
    const btn = document.querySelector("button");

    function ajax({url,scession}){
        const xhr = new XMLHttpRequest();
        xhr.open("get",url,true);
        xhr.onload=function(){
            const resJSON = JSON.parse(xhr.response)
            scession(resJSON);
        }
        xhr.send();
    }

    btn.addEventListener("click",()=>{
        ajax({
            url:"https://dog.ceo/api/breeds/image/random",
            scession(arg){
                img.src = arg.message;
                console.log(arg);
            }
        })
    })
    
</script>